我正在 Vala 0.14 中开发一个音乐播放器应用程序。此应用程序的主工具栏包含嵌套Box Layouts，并且所有这些工具栏的hexpand属性都设置为true。
在打包小部件/布局时，我确保expand和fill参数是true，但是当父窗口的大小发生变化时，工具栏无法调整大小。
这是屏幕截图。
[普通的]
[调整大小 -- 增加大小]
[调整大小 -- 减小大小]
当父窗口的信号发出时，将hexpand属性设置为是否足够，true或者我是否需要对框布局进行一些调整？size_allocate
代码：
using Gtk;
namespace Conjure.Widget
{
public class MainToolBar : Object
{
/* Declare reference variables */
private Toolbar tlbMain;
private ToolItem tiMain;
public Scale sclProgress;
private Label lblSongName;
private Label lblArtistName;
private Label lblAlbumName;
private Box hboxMain;
private Box vboxControls;
private Box hboxControls;
private Box hboxButtons;
private Box hboxMetaData;
private Box vboxMetaData;
private Box vboxPreferences;
private Box hboxPreferences;
private Image imgArt;
private Image icnPrevious;
public Image icnPlay;
public Image icnPause;
private Image icnNext;
private Image icnRepeat;
private Image icnVolume;
private Image icnPhone;
private Image icnSuperMenu;
private Image icnEqualizer;
public Button btnPrevious;
public Button btnTogglePlay;
public Button btnNext;
public Button btnVolume;
public Button btnSuperMenu;
public Button btnEqualizer;
private ToggleButton btnPhone;
private ToggleButton btnRepeat;
private Separator sep1;
private Separator sep2;
construct
{
/* Create the parent box */
hboxMain = new Box(Orientation.HORIZONTAL, 0);
hboxMain.hexpand = true;
hboxMain.homogeneous = true; //
/* Create boxes to hold meta data */
hboxMetaData = new Box(Orientation.HORIZONTAL, 5);
vboxMetaData = new Box(Orientation.VERTICAL, 0);
vboxMetaData.homogeneous = true;
hboxMetaData.hexpand = true;
vboxMetaData.hexpand = true;
/* Create boxes for control elements */
vboxControls = new Box(Orientation.VERTICAL, 0);
hboxControls = new Box(Orientation.HORIZONTAL, 0);
hboxButtons = new Box(Orientation.HORIZONTAL, 0);
vboxControls.homogeneous = true;
vboxControls.hexpand = true;
hboxButtons.homogeneous = false;
hboxButtons.hexpand = true;
hboxButtons.halign = Align.CENTER;
hboxControls.hexpand = true;
/* Create boxes for preference control */
vboxPreferences = new Box(Orientation.VERTICAL, 0);
hboxPreferences = new Box(Orientation.HORIZONTAL, 0);
vboxPreferences.hexpand = true;
hboxPreferences.hexpand = true;
/* Create and load image mockup */
imgArt = new Image();
//imgArt.set_from_file("/home/utsav/jmrfs.png");
imgArt.halign = Align.START;
/* Make labels for meta data */
lblSongName = new Label(null);
lblArtistName = new Label(null);
lblAlbumName = new Label(null);
lblSongName.set_markup_with_mnemonic("<b>Down</b>");
lblArtistName.set_markup_with_mnemonic("Jay Sean ft. Lil' Wayne");
lblAlbumName.set_markup_with_mnemonic("All or Nothing");
lblSongName.halign = Align.START;
lblArtistName.halign = Align.START;
lblAlbumName.halign = Align.START;
lblSongName.hexpand = true;
lblAlbumName.hexpand = true;
lblArtistName.hexpand = true;
/* Create audio progress bar */
sclProgress = new Scale(Gtk.Orientation.HORIZONTAL, new Adjustment(0.0, 0.0, 10.0, 0.1, 1.0, 1.0));
sclProgress.draw_value = false;
sclProgress.width_request = 300;
// Stylize control
/*StyleContext style_context = sclProgress.get_style_context();
CssProvider css_provider = new CssProvider();
try
{
css_provider.load_from_path(Conjure.Utility.path_to_assets () + "/css/style.css");
}
catch(Error e)
{
stderr.puts("Unable to load specified style sheet.");
}
style_context.add_provider(css_provider, STYLE_PROVIDER_PRIORITY_THEME);*/
/* Create toolbar buttons */
btnPrevious = new Button();
btnTogglePlay = new Button();
btnNext = new Button();
btnVolume = new Button();
btnSuperMenu = new Button();
btnEqualizer = new Button();
btnRepeat = new ToggleButton();
btnPhone = new ToggleButton();
btnPrevious.hexpand = false;
icnPrevious = new Image();
icnPause = new Image();
icnPlay = new Image();
icnNext = new Image();
icnPhone = new Image();
icnRepeat = new Image();
icnVolume = new Image();
icnSuperMenu = new Image();
icnEqualizer = new Image();
/*icnPrevious.set_from_file(Conjure.Utility.path_to_assets () + "/icons/media-skip-backward.png");
icnPlay.set_from_file(Conjure.Utility.path_to_assets () + "/icons/media-playback-start.png");
icnPause.set_from_file(Conjure.Utility.path_to_assets () + "/icons/media-playback-pause.png");
icnNext.set_from_file(Conjure.Utility.path_to_assets () + "/icons/media-skip-forward.png");
icnPhone.set_from_file(Conjure.Utility.path_to_assets () + "/icons/phone.png");
icnRepeat.set_from_file(Conjure.Utility.path_to_assets () + "/icons/media-playlist-repeat.png");
icnVolume.set_from_file(Conjure.Utility.path_to_assets () + "/icons/audio-volume-high.png");
icnSuperMenu.set_from_file(Conjure.Utility.path_to_assets () + "/icons/document-properties.png");
icnEqualizer.set_from_file(Conjure.Utility.path_to_assets () + "/icons/media-graphic-equalizer.png");
btnPrevious.image = icnPrevious;
btnNext.image = icnNext;
btnTogglePlay.image = icnPlay;
btnPhone.image = icnPhone;
btnRepeat.image = icnRepeat;
btnVolume.image = icnVolume;
btnSuperMenu.image = icnSuperMenu;
btnEqualizer.image = icnEqualizer;*/
sep1 = new Separator(Orientation.VERTICAL);
sep2 = new Separator(Orientation.VERTICAL);
/* Start packing widgets */
// Pack Meta Data Box
vboxMetaData.pack_start(lblSongName, true, true, 0);
vboxMetaData.pack_start(lblAlbumName, true, true, 0);
vboxMetaData.pack_start(lblArtistName, true, true, 0);
hboxMetaData.pack_start(imgArt, false, true, 0);
hboxMetaData.pack_start(vboxMetaData, true, true, 0);
// Pack controls box
vboxControls.pack_start(sclProgress, true, true, 0);
hboxButtons.pack_start(btnPrevious, false, false, 0);
hboxButtons.pack_start(btnTogglePlay, false, false, 0);
hboxButtons.pack_start(btnNext, false, false, 0);
hboxButtons.pack_start(sep1, false, false, 0);
hboxButtons.pack_start(btnRepeat, false, false, 0);
hboxButtons.pack_start(btnVolume, false, false, 0);
hboxButtons.pack_start(sep2, false, false, 0);
hboxButtons.pack_start(btnPhone, false, false, 0);
vboxControls.pack_start(hboxButtons, true, true, 0);
// Pack preference box
hboxPreferences.pack_end(btnSuperMenu, false, false, 0);
hboxPreferences.pack_end(btnEqualizer, false, false, 0);
vboxPreferences.pack_end(hboxPreferences, false, false, 0);
vboxPreferences.halign = Align.END;
// Pack main box
hboxMain.pack_start(hboxMetaData, true, true, 0);
hboxMain.pack_start(vboxControls, true, true, 0);
hboxMain.pack_start(vboxPreferences, true, true, 0);
/* Create ToolItem */
tiMain = new ToolItem();
tiMain.add(hboxMain);
tiMain.hexpand = true;
/* Create Toolbar */
tlbMain = new Toolbar();
tlbMain.add(tiMain);
tlbMain.hexpand = true;
tlbMain.vexpand = false;
}
public void resize_main_layout()
{
}
public Gtk.Widget toolbar
{
get
{
return tlbMain;
}
}
}
}
【主模块】
using Gtk;
using Conjure.Widget;
namespace Conjure.App
{
public class MainWindow : Window
{
private Box vboxMain;
private Box hboxPlaylists;
private MainToolBar maintoolbar;
/*private Conjure.Library.MusicPlayer player;
private SyncThread t;
public Cancellable c;
private unowned Thread<void*> t_a;
// dummy variable
bool track_selected;*/
construct
{
this.title = "Conjure";
this.set_default_size(905, 600);
this.window_position = WindowPosition.CENTER;
//t = null;
//c = null;
//track_selected = true;
vboxMain = new Box(Orientation.VERTICAL, 0);
hboxPlaylists = new Box(Orientation.HORIZONTAL, 0);
maintoolbar = new MainToolBar();
//player = Conjure.Library.MusicPlayer.get();
vboxMain.homogeneous = false;
vboxMain.pack_start(maintoolbar.toolbar, false, true, 0);
//maintoolbar.btnTogglePlay.clicked.connect(toggle_play_clicked);
maintoolbar.sclProgress.set_state (Gtk.StateType.INSENSITIVE);
/*player.state_changed.connect(() =>
{
if(player.get_state() == Conjure.Library.States.READY)
{
track_selected = true;
update_metaphors ();
}
});*/
/*maintoolbar.sclProgress.change_value.connect((s, d) =>
{
stderr.printf("Moved\n");
player.toggle_play ();
player.seek_player((int64) d);
player.toggle_play ();
});
this.size_allocate.connect((allocation) =>
{
stderr.printf("Resized\n");
maintoolbar.resize_main_layout ();
vboxMain.resize_children ();
});*/
vboxMain.hexpand = true;
add(vboxMain);
}
/*void toggle_play_clicked(Gtk.Widget w)
{
w.set_sensitive (false);
if (new_track_selected () && player.get_state() != Conjure.Library.States.PLAYING)
{
stderr.puts("A\n");
kill_thread ();
player.set_track("/home/utsav/abc.mp3");
player.toggle_play ();
make_and_run_thread ();
}
else if (player.get_state() == Conjure.Library.States.PLAYING)
{
stderr.puts("B\n");
kill_thread ();
player.toggle_play ();
}
else if (!(new_track_selected ()) && player.get_state() == Conjure.Library.States.PAUSED)
{
stderr.puts("C\n");
player.toggle_play();
make_and_run_thread ();
}
update_metaphors ();
w.set_sensitive (true);
}*/
/*bool new_track_selected()
{
// method stub
bool p;
p = track_selected;
track_selected = false;
return p;
}*/
/*void kill_thread ()
{
try
{
if(c!=null)
{
c.cancel ();
t_a.join();
}
}
catch(ThreadError err)
{
stderr.printf ("Error: %s", err.message);
}
}
void make_and_run_thread()
{
try
{
c = new Cancellable();
t = new SyncThread(maintoolbar.sclProgress, player.audio_player (), c);
t_a = Thread.create<void*> (t.thread_func, true);
}
catch(ThreadError err)
{
stderr.printf ("Error: %s", err.message);
}
}*/
/*void update_metaphors()
{
if(player.get_state()== Conjure.Library.States.PLAYING)
{
maintoolbar.btnTogglePlay.image = maintoolbar.icnPause;
}
else
{
maintoolbar.btnTogglePlay.image = maintoolbar.icnPlay;
}
}*/
}
}